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Feb2313 08:41 AM
ZapperZ

1 
21,057 
God particle is 'found': Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered...

Jul1112 01:13 AM
tom.stoer

178 
34,439 
So I was thinking what are the differences between ionization and radiation energy loss for particles through a...

Apr414 03:03 AM
Lumberjack400

3 
510 
what is breit wigner distribution function ?
it is used in resonance scan means it decides the no of events for any...

Apr314 07:58 AM
Einj

7 
593 
In beta decay, is the W boson created by the change of a quark or does it cause the change? Also, I don't fully...

Apr214 05:31 PM
mfb

8 
541 
I am currently confused... I read that we don't know yet where does the proton spin come from.
But I wonder...
1)...

Apr214 11:46 AM
Vanadium 50

14 
809 
P.W. Anderson in his essay "more is different" said that:
"no stationary state of a system has an electric dipole...

Apr214 09:41 AM
Bill_K

1 
368 
In the process of particle decay (eg carbon14 > nitrogen14), is there any relations with radioactivity? Is it...

Mar3114 12:43 PM
mfb

6 
552 
I think this is more or less a quick question.
So deuteron (pn) is an isosinglet in the state 00>...

Mar3114 05:04 AM
Bill_K

1 
454 
There are many other particles having a larger nucleus than carbon14 but they are stable. Why?
Why is carbon14...

Mar3014 05:46 PM
mfb

6 
470 
Hi everyone. I was trying to reproduce the calculation needed to include the QCD correction to the low energy...

Mar2914 01:57 PM
pbrane

3 
542 
Hi,
I was just trying to draw a Feynman diagram for ψ' to χ_{c} states.
So we have a electromagnetic transition.
...

Mar2914 08:09 AM
mfb

1 
393 
Hi,
I am looking into symmetry breaking and how it (may have) affected the photon/baryon ratio in the primordial...

Mar2914 07:53 AM
nSlavingBlair

5 
630 
This question is probably very oversimplistic, however: if neutrinos are majorana particles, which are their own...

Mar2914 07:23 AM
lizzie96

4 
428 
Hi everyone, I have a doubt on Fierz identities. If we define the following quantities: S=1,\; V=\gamma_\mu,\;...

Mar2714 12:30 PM
Einj

2 
432 
Assume that, in cartesian coordinate, we have a quark with momentum ##k=(k_0,0,k_0sin\theta,k_0\cos\theta)## and a...

Mar2614 10:24 PM
Chenkb

0 
443 
I'm a little confused about whether the higgs boson is the mediator of the higgs field. I haven't had a chance to...

Mar2614 09:27 PM
Simon Bridge

31 
2,255 
Hi, I'm trying to understand the process in the Feynman diagram below:
http://i.imgur.com/K6OO2jp.png
...

Mar2614 08:52 AM
Hepth

9 
414 
Hello. My teacher and I have had this very intense debate for quite some time now and we need your opinion on this...

Mar2514 04:30 PM
fakecop

6 
510 
Hi I am having trouble following the derivation of the fermionic oscillator partition function in zeta function...

Mar2514 03:52 PM
sgd37

0 
414 
Hi,
I've been reading about Feynman diagrams lately and I'm trying to understand the pair annihilation diagram. The...

Mar2514 04:46 AM
ChrisVer

5 
513 
Various astrophysical processes produce antineutrinos, which then fly off into outer space. I assume there are pretty...

Mar2514 04:02 AM
ofirg

11 
486 
Current main stream theory is neutrinos must have mass. Recent paper claims its on the order of 5 to 50 eV (I've...

Mar2414 05:38 AM
phyzguy

9 
581 
If an electrically charged particle is a scalar, and a magnetically charged particle is a pseudoscalar, then what is a...

Mar2314 05:43 PM
bsaucer

2 
378 
For a 2nd order electronpositron scattering, the following diagrams are possible:...

Mar2214 06:05 PM
daca

15 
943 
I am not sure whether this belongs here or not, but I'll try this topic insteed of SR+GR
I was wondering, since...

Mar2214 12:41 PM
ChrisVer

7 
447 
why massless particle, such as photon, can only have two helicity states?
Photon's helicity is 1,1. Helicity zero is...

Mar2114 02:43 PM
samalkhaiat

4 
559 
Hi, all. Could anyone recommend some good software for modeling nuclear physics? I have concept nuclear rocket that I...

Mar2114 10:37 AM
KarenRei

0 
365 
If gauge symmetries are really just redundancies in our description accounting for nonphysical degrees of freedom,...

Mar2014 12:38 PM
ChrisVer

11 
860 
Hi guys,
I am currently trying to figure out the best way to create a target of deuterated polyethylene for neutron...

Mar1914 04:05 PM
CFlower

0 
497 
Say a uranium238 nucleus with angular momentum II decays to thorium234 plus an alpha particle. Will the sum of the...

Mar1914 10:33 AM
dauto

2 
465 
Hi,
I am selfteaching Quantum Elctrodynamics, and have come across something which I do not understand. I would...

Mar1914 08:35 AM
boltzman1969

2 
491 
I know what gauge invariance is, but I'm not sure what gauge covariance is. Is it that a given field has a gauge...

Mar1714 02:10 AM
tom.stoer

14 
2,481 
Hello,
there are several papers on QCD in Hamiltonian formulation, especially in Coulomb gauge. Unfortunately the...

Mar1514 01:03 PM
tom.stoer

2 
564 
Dear all;
why we study hadron physics? For instance different people calculates the decay constant of mesons using...

Mar1414 01:08 PM
mfb

1 
565 
In atomic bomb there are two hemispheres of fission material (Uranium or Plutonium), they are joined by means of...

Mar1314 08:48 AM
Eagle9

5 
639 
Hi folks  I have three questions on MontonenOlive duality. This duality switches the electric and magnetic...

Mar1214 10:24 AM
metroplex021

0 
494 
"Antimatter gravity could explain Universe's expansion:"
http://phys.org/news/201104antimattergr...expansion.html...

Mar1114 03:41 PM
mfb

26 
3,360 
Hey there,
Does anyone have a table will all the particles and their respective spin, lepton number, mass, etc etc?...

Mar1114 01:16 PM
Strange

4 
476 
Hi everyone, I have a doubt which was actually raised by a recent discussion on this forum.
We know that Furry's...

Mar1114 09:52 AM
Vanadium 50

2 
451 
Dear all
When we calculating the cross section of particles, we apply the trace calculation. This is not clear for...

Mar1114 08:56 AM
dauto

2 
474 
If we scatter unpolarized electrons off each other and we calculate the amplitude for electrons to scatter into final...

Mar1114 08:24 AM
Einj

4 
460 